diff --git a/ChangeLog b/ChangeLog
index 4539604b8d..4aa83572b9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat May 12 15:43:55 2001  Usaku Nakamura  <usa@osb.att.ne.jp>
+
+	* win32/win32.c (kill): add support of signal 9 on mswin32/mingw32.
+
 Fri May 11 15:09:52 2001  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* ruby.h (rb_string_value): add volatile to avoid compiler warning.
diff --git a/win32/win32.c b/win32/win32.c
index 15a9a2a673..b67a094fe4 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -2559,18 +2559,36 @@ chown(const char *path, int owner, int group)
 int
 kill(int pid, int sig)
 {
-#if 1
-	if ((unsigned int)pid == GetCurrentProcessId())
-		return raise(sig);
+    if ((unsigned int)pid == GetCurrentProcessId())
+	return raise(sig);
 
-	if (sig == 2 && pid > 0)
-		if (GenerateConsoleCtrlEvent(CTRL_C_EVENT, (DWORD)pid))
-			return 0;
+    if (sig == 2 && pid > 0) {
+	if (!GenerateConsoleCtrlEvent(CTRL_C_EVENT, (DWORD)pid)) {
+	    errno = GetLastError();
+	    return -1;
+	}
+    }
+    else if (sig == 9 && pid > 0) {
+	HANDLE hProc;
 
+	hProc = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
+	if (hProc == NULL || hProc == INVALID_HANDLE_VALUE) {
+	    errno = GetLastError();
+	    return -1;
+	}
+	if (!TerminateProcess(hProc, 0)) {
+	    errno = GetLastError();
+	    CloseHandle(hProc);
+	    return -1;
+	}
+	CloseHandle(hProc);
+    }
+    else {
+	errno = EINVAL;
 	return -1;
-#else
-	return 0;
-#endif
+    }
+
+    return 0;
 }
 
 int